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Why is one of my DNS servers logging Event ID 4521 every 3 minutes for the last 2 months or more?

I am having an authentication problem with a Windows 2000 machine (not server), and for whatever reason i looked at my primary DNS server. The DNS event log is full of Event ID 4521's that log every 3 minutes, and a few 3000 and 9999 (few and far between). My secondary DNS server, on the other hand, has no warnings at all. All i could find on this ID is to troubleshoot active directory. Anyone have any idea's? Log entry is below.


Event Type:      Warning
Event Source:      DNS
Event Category:      None
Event ID:      4521
Date:            2/17/2009
Time:            9:52:39 AM
User:            N/A
Computer:      SERVER3
Description:
The DNS server encountered error 9002 attempting to load zone . from Active Directory. The DNS server will attempt to load this zone again on the next timeout cycle. This can be caused by high Active Directory load and may be a transient condition.

For more information, see Help and Support Center at http://go.microsoft.com/fwlink/events.asp.
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dhoffman_98
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Worked perfectly. Thanks.